In the animal world I think longer life spans are correlated to a low ratio of metabolic expenditure to body weight. The lower the number the higher the life expectancy.
Aging is a cellular phenomena and there is no reason why cells should have to age at all. With the right technology we could provide restorative capabilities to all of our cells; in fact, that is all that aging is – the inability for the body to restore its organs’ cells to a normal functioning capacity and number.
If we think about what a metabolism is we can understand how it might affect our cells’ recovery processes. More energy and nutrients can be devoted to cell regeneration if we are able to store more nutrients in a larger body. A slow metabolism would ensure that energy is being distributed to the organs as needed instead of being burned off as heat when we are in a sedentary state.
To echo the OP I think a high nutrient low-calorie diet would be effective in achieving a lower metabolism. Training with weights would ensure that our body mass remains dense so we can store those nutrients.
Also, I think one characteristic that is important to a longer life is the pace of life one has – meaning, are we always rushed and in a hurry to get to the next appointment; do we take time for ourselves to slow down and just relax? Being in a constant state of stress cannot be good in this regard.[/quote]
You make some good points. I’m not sure it will ever be possible to continually restore cells ad infinitum. Certainly, it will be possible to do so up to a point, which would be an improvement over today, but perhaps our bodies have a finite shutdown point at which time no more regeneration can take place. Kind of like a rechargeable battery. Can the earth actually sustain a population that doesn’t age?